Scaffold jack



June 4, 14940. R. A. uEcKER Er AL SCAFFOLD JACK Filed Sept. 19, 1958 I ZQLPZZ .y ff. opzien- Patented June 4, 1940 SCAFFOLD JACK Reinhold A. Uecker, Ingar G. Rambo, and David E. Beatty.- Wauwatosa, Wis.

Application September 19, 1.938, Serial No. 230,649

f 3 Claims.

This invention relates to scaffold jacks and more particularly to a scaffold jack adapted to compensate for variations in elevation of a scaffold foundation.

One object of the present invention is to provide a jack to raise the bottom of a scaifold and hold the scaffold rigidly in position.

Another object is to provide a scail'old jack which. may be readily applied to the scaffold.

A further object is`to provide a scaffold jack in which the danger of disengagement from the scaffold will be minimized.

Another object is to provide a jack for a scaffold which is adapted to t between a standard baseI plate and the end of the scaffold.

Other objects will be apparent from the following description,

l According to this invention the jack is made with a sleeve xed on the end of the screw en- 20 gageable with the interior of a scaffold post, and

a nut on the screw having a collar formed thereon fitting within the post, the collar and sleeve cooperating to space the screwthreads from the interior of the scaiold post and prevent wabbling of the scalo'ld on the jack.

In .the drawing: Fig. 1 shows` parts of two scaffold-end frames with the jacks in place thereon;

. Fig. 2 is an enlarged cross-section through a scaffold post showing the jack positioned between the end of the scaffold post and a base plate;

Fig. 3 is a cross-sectional view of the upper end of the jack shown in Fig, 2;

Fig. 4 is anelevational view taken at right angles to Fig. 3;

Fig'. 5 is a cross-section on the line 5-5 of Fig. 2 looking in the direction of the arrows; and Fig. 6 is an elevational view of a coupling pin. Referring to `the drawing. theA scaifold shown is of the sectional type in which a plurality of end frames I0 are superimposed upon each other to build a tower to any height. lSuch a scalold is fully described in the U. S. patent to Reinhold A. Uecker, Serial No. 2,043,498, issued June 9, 1936. 45 As shown, each end frame comprises a pair of vertical posts II-V-II, spaced -apart and held in spaced parallel relationship by horizontal braces I2-I2. Y

On uneven ground it is sometimes necessary to 55 working twithin the post Il.

jack up one or more posts of the scaffold so that of the screw is xed a second sleeve I6 having substantially the same' inside diameter as -the post, and engageable over a standard base plate I8. A nut 20 fits on the screw I4 and adjusts the position of the bottom of the post II relative 5 to the base plate.

, The screw I4 fits within the sleeve I Sand is Vfixed therein, preferablyby welding. A spring retaining member 22 is positioned within the sleeve I5, and projects out through a slot 23 in the wall 10 of the sleeve to grip the interior of the post II and prevent accidental disengagement of the jack from the scaiold.

The sleeve I6 has an interior diameter preferably the same as the interior diameter of the 16 post II so that it can receive the standard base tting I8 or a coupling pin 24 and be held in engagement therewith by a spring retaining member 25 formed inthe upstanding pin 26 of the base plate I8. l

The nut 20 is formed with an upstanding collar 21 on the upper end of the nut which terminates at its lower end in a shoulder 28. The collar 2l receives the interior of the post II while.

the shoulder 28 forms a base upon which the 25 post rests.

The collar 21 thus cooperateswith the sleeve I5 to -form a unitary rigid column, and prevents wabbling of the screw I4 within the post, The sle'eve I5 and the collar 21 also serve to spa'ce 30 the screw from the interior of the post and so prevent damage to the threads.

The nut 20 may be provided with handles 30-30 to facilitate turning the nut and adjusting its position on the screw I4. 35

It is obvious that the jack may also be used to support a second endframe I0' by mounting the lower sleeve I6 of the jack over the coupling pin` 24 (Fig. 1) in the top of one frame, and mounting a second frame over the sleeve I5 and onto' 40 the shoulder 28.

Having thus described the invention it is hereby claimed as follows: Y

1. In a scaiold jack for use with a scaffold having a tubular post', a screw, a sleeve xed on 45 one end of said screw and engageable with the interior of-said post, a'nut adjustable on said screw, a collar on said nut rotatably engageable v with the interior of said post, and means to releasably retain the sleeve within the post.

2. A jack for use with a scaffold having a vertical post and a scaiold member having a tubular pin connected therewith, said jack comprising a screw, a rst sleeve fixed on one end of said On the lowerendscrew and engageable with the interior of saidV 56 post, a second sleeve -on the other end of said v screw engageable over said pin, a nut adjustable on said screw, and a collar on said nut engageable within the post and co-operating with the first named sleeve to retain the screw in alinement with the post and to maintain the post and the scaffold member in spaced relationship..

3. In a scaioid jack for use with a scaiold having a tubular post, a screw projectable into said 10 post, a sleeve xed on said screw and engageable with the interior of said tubular post, a nut adjustable on said' screw, and a collar formed on said nut rotatably engageable withthe interior of said post, said sleeve and said collar cooperab.

ing to Ivaintain the threaded portion of said screw spaced from the interior of said post.

REINHOLD A. UECKER. INGAR G. RANIBO. DAVID E. BEA'ITY. 

